Need Help with my group

Ok my group is a nonspam group, this is a serioes group in my line of work toruism, I have now only 2200 members and need it to reach around 100.000 fast, the group is 1 year old and I have not been working so mutch withit.
I have been working alot with other projects with faceboo but only spaming.
So I need some help to get alot of members to this serioes group, any suggestions how to do this good....I want real members, all over the world is ok but prefer european since my customers mostley come from there...

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